a
a physical change
b
a chemical change
c
the formation of a mixture
d
an endothermic change
Explanation
Correct Option
bNo explanation available
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Discussions (10)

Freedom123
6 years ago
The wixture will asorb CO2 (carbon dioxide) from the atmosphere forming carbonic acid (H2CO3) which will react with the calcium oxide to form calcium carbonate. The basis for the curing of cement & concrete.

abdulsalam.saliu
4 years ago
Yes. This is true because it is not a reversible reaction and the reaction is exothermic.
CaO+ H20 -----> Ca(OH)2 + Heat.

marisss
7 years ago
correct becos no new substance is formed in a chemical change...it is irreversible


